Robustness and flexibility in compact quasiaxial stellarators: Global ideal magnetohydrodynamic stability and energetic particle transport
Robustness and flexibility in compact quasiaxial stellarators: Global ideal magnetohydrodynamic stability and energetic particle transport
复制标题
紧凑型准轴仿星器的鲁棒性和灵活性：全局理想的磁流体动力学稳定性和高能粒子输运
DOI：
10.1063/1.874090
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发表时间：
2000
影响因子：
2.2
通讯作者：
NCSX
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作者：
M. Redi;A. Diallo;W. A. Cooper;C. Nührenberg;N. Pomphrey;A. Reiman;M. Zarnstorff;NCSX
通过研究不同的压力和旋转变换曲线对预期性能的影响，解决了对紧凑型准轴星光仪设计的灵活性和稳健性的担忧。对30种相关的全三维构型的整体理想磁流体稳定性和高能粒子输运进行了评估。结果表明，托卡马克直觉与理解磁流体稳定性有关，压力梯度驱动项和剪切稳定化同时控制着周期保持项N=0和非周期保持项N=1不稳定扭结模。整体扭结模是由半半径附近陡峭的压强分布和边缘局部扭结模产生的，边缘压强分布陡峭且边缘旋转变换大于0.5的等离子体存在局域扭结模。高能粒子输运并不强烈地依赖于压力和电流(或旋转变换)轮廓的这些变化，尽管发现了通过相应的沙夫洛夫位移达到峰值的压力的弱逆依赖。虽然在这些平衡中，良好的传输和MHD稳定性并不是反相关的，但稳定性只是由压力和剪切稳定力的微妙平衡产生的。对于这一大组平衡点，发现了一系列有趣的MHD行为，表现出类似的粒子输运性质。(C)2000年美国物理研究所。[S1070-664X(00)03606-5]。
Concerns about the flexibility and robustness of a compact quasiaxial stellarator design are addressed by studying the effects of varied pressure and rotational transform profiles on expected performance. For thirty, related, fully three-dimensional configurations the global, ideal magnetohydrodynamic (MHD) stability and energetic particle transport are evaluated. It is found that tokamak intuition is relevant to understanding the magnetohydrodynamic stability, with pressure gradient driving terms and shear stabilization controlling both the periodicity preserving, N=0, and the nonperiodicity preserving, N=1, unstable kink modes. Global kink modes are generated by steeply peaked pressure profiles near the half radius and edge localized kink modes are found for plasmas with steep pressure profiles at the edge as well as with edge rotational transform above 0.5. Energetic particle transport is not strongly dependent on these changes of pressure and current (or rotational transform) profiles, although a weak inverse dependence on pressure peaking through the corresponding Shafranov shift is found. While good transport and MHD stability are not anticorrelated in these equilibria, stability only results from a delicate balance of the pressure and shear stabilization forces. A range of interesting MHD behaviors is found for this large set of equilibria, exhibiting similar particle transport properties. (C) 2000 American Institute of Physics. [S1070-664X(00)03606-5].
伊藤公隆：等离子体物理学和受控聚变。31。（1989）
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Schwab,C：“理想磁流体动力学：三维等离子体构型的全局模式分析”流体物理学 B 5. 5(9)。
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